Overview
The AD7837AN, produced by Analog Devices Inc., is a complete, dual 12-bit multiplying digital-to-analog converter (DAC) with output amplifiers integrated on a monolithic CMOS chip. This device is designed to be microprocessor compatible, featuring high-speed data latches and interface logic. It does not require external user trims to achieve full specified performance, making it a reliable choice for various applications. The AD7837AN is fabricated using Linear Compatible CMOS (LC2MOS), a mixed technology process that combines precision bipolar circuits with low-power CMOS logic.
Key Specifications
| Parameter | Value | Units | Test Conditions/Comments |
|---|---|---|---|
| Resolution | 12 | Bits | |
| Relative Accuracy | ±1 LSB max | TMIN to TMAX unless otherwise noted | |
| Differential Nonlinearity | ±1 LSB max | TMIN to TMAX unless otherwise noted | |
| Zero Code Offset Error | ±2 mV max @ +25°C | mV | DAC Latch Loaded with All 0s |
| Temperature Coefficient | ±5 µV/°C typ | µV/°C | |
| Gain Error | ±4 mV max @ +25°C | mV | |
| Output Voltage Range | ±10 V | V | Across a 2 kΩ load |
| Operating Temperature Range | -40°C to +85°C | °C | |
| Package Types | 24-Lead PDIP, 24-Lead SOIC (Wide), 24-Lead CerDIP (Narrow 0.3 Inch) |
Key Features
- Microprocessor Compatibility: High-speed data latches and interface logic ensure compatibility with microprocessors.
- No External Trims Required: Achieves full specified performance without the need for external user trims.
- Dual 12-Bit DACs: Each DAC has its own input and output latches, allowing for independent control of each DAC.
- Output Amplifiers: Capable of developing ±10 V across a 2 kΩ load, with low input offset voltage due to laser trimming at wafer level.
- Advanced Fabrication Process: Fabricated using Linear Compatible CMOS (LC2MOS), combining precision bipolar circuits with low-power CMOS logic).
- Low Leakage Configuration: Ensures low offset errors over the specified temperature range, thanks to a novel low leakage configuration (U.S. Patent No. 4,590,456)).
Applications
- Motor Control: The AD7837AN can be used in motor control systems due to its precision and reliability.
- Data Distribution: Suitable for applications requiring precise data distribution and conversion).
- General Industrial Automation: Can be used in various industrial automation tasks that require accurate analog output signals from digital inputs.
Q & A
- What is the resolution of the AD7837AN DAC?
The AD7837AN has a resolution of 12 bits).
- What is the operating temperature range of the AD7837AN?
The operating temperature range is -40°C to +85°C).
- Does the AD7837AN require external user trims?
No, the AD7837AN does not require external user trims to achieve full specified performance).
- What is the output voltage range of the AD7837AN?
The output amplifiers can develop ±10 V across a 2 kΩ load).
- What are the package types available for the AD7837AN?
The AD7837AN is available in 24-Lead PDIP, 24-Lead SOIC (Wide), and 24-Lead CerDIP (Narrow 0.3 Inch) packages).
- Is the AD7837AN microprocessor compatible?
Yes, the AD7837AN is microprocessor compatible with high-speed data latches and interface logic).
- What fabrication process is used for the AD7837AN?
The AD7837AN is fabricated using Linear Compatible CMOS (LC2MOS)).
- What is the significance of the low leakage configuration in the AD7837AN?
The low leakage configuration ensures low offset errors over the specified temperature range, thanks to a novel configuration (U.S. Patent No. 4,590,456)).
- How does the LDAC input function in the AD7837AN?
The LDAC input controls the transfer of 12-bit data from the input latches to the DAC latches and is asynchronous and independent of WR).
- What are some common applications of the AD7837AN?
The AD7837AN is commonly used in motor control, data distribution, and various industrial automation tasks).
